JPS6358023A - Heat-cooking apparatus - Google Patents

Abstract

PURPOSE:To make it possible to positively perform an automatic fire extinguishment when a cooking temperature is raised and reaches an automatic fire extinguishing temperature by providing at least two electric means for controlling the operation of gas opening and closing part. CONSTITUTION:After ignition, when the temperature of a pan is raised by heating and the temperature detected by a thermistor reaches an automatic fire extinguishing temperature, a microcomputer 36 detects that the temperature of the pan has reached the automatic fire extinguishing temperature, and transmits a relay coil exciting signal to an OR circuit 22 thereby to open a relay switch 31. As a result, an electric current which has flowed to a coil 27 is interrupted, a safety valve 21 is closed, the supply of gas is interrupted, and automatic fire extinguishment is carried out. Further, when the temperature detected by the thermistor 3 reaches an automatic fire extinguishing temperature, an input voltage to a comparison circuit 29 is raised more than a reference voltage, and a relay coil exciting signal is generated at the output end of the comparison circuit 29. This exciting signal is inputted to the OR circuit 22 thereby to excite the relay coil 32 through a driver 34, to close the safety valve 21 and to stop the supply of the gas, thus carrying out the automatic fire extinguishment.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to heating cooking utensils, and more specifically,
Key 1 by temperature sensor! [! The present invention relates to a heating cooking appliance that can detect the temperature of steel and can stop the supply of gas using a gas opening/closing means such as a solenoid valve.

<Prior Art> The heating cooking appliance described above is equipped with a temperature sensor made of a thermistor, bimetal, or the like that detects the temperature by contacting the bottom of the pot. Then, the optimal cooking temperature is set according to the cooking content, and the heating power is adjusted based on the cooking temperature. In order to prevent fires, for example, based on the ignition humidity of oil, an automatic extinguishing temperature is set which is a predetermined lower temperature than this ignition temperature, taking into account safety, etc., and the temperature detected by the temperature sensor reaches this automatic extinguishing temperature. Then, a solenoid valve is driven to stop gas supply to the burner and automatically extinguish the fire (see Japanese Patent Publication No. 60-4734).

<Problems to be solved by the invention> The above-mentioned heating cooking utensil is difficult to solve. I! Since the heating power is adjusted based on temperature, the heating power adjustment is normally controlled by a microcomputer. Furthermore, the microcomputer also determines when the detected temperature has reached the automatic extinguishing temperature and controls the sending of the solenoid valve drive signal to stop the gas supply to the burner when the automatic extinguishing temperature is reached. ing.

However, in the above heating cooking appliance, if the microcomputer malfunctions during heating over high heat, the heating power cannot be adjusted, so heating will continue over high heat. Therefore, the automatic extinguishing temperature is quickly reached and there is a risk of fire, so it is necessary to stop the gas immediately. However,
Because the microcomputer was out of order, it was no longer possible to drive the gas opening/closing means, so there was a problem in that the gas could not be turned off on its own.

<Object of the Invention> This invention was made in view of the above problems, and even when the cooking temperature rises and reaches the automatic extinguishing temperature,
The purpose of this heating cooking appliance is to provide a heating cooking appliance that can reliably automatically extinguish the fire. 16゜〈Means for solving the problem〉 In order to achieve the above purpose, this heating cooking appliance of Satamei is equipped with a gas opening/closing means. The invention is characterized in that it has at least two electrical means for controlling the driving of the motor.

One of the above electrical means is a microcomputer,
The other one may be a comparison circuit that operates independently of the microcomputer.

Function> With the heating cooking appliance having the above configuration, when the automatic extinguishing temperature is reached, each electric means controls the drive of the gas opening/closing means, and automatic extinguishing can be performed. Also, 1
When one electric means fails, even if the automatic extinguishing temperature is reached, the other electric means is activated to drive the gas opening/closing means to automatically extinguish the fire.

If one of the electrical means described above is performed by a microcomputer, if the microcomputer fails, the fire power adjustment function is stopped and heating continues, so that the automatic extinguishing temperature is quickly reached. Even in that case,
Since the comparison circuit compares the output of the temperature sensor with a reference value corresponding to the automatic extinguishing temperature and detects that the automatic extinguishing temperature has been reached, the fire can be extinguished automatically.

<Examples> Hereinafter, examples will be explained in detail with reference to the accompanying drawings showing examples.

FIG. 1 is a perspective view of the heating cooking appliance of this invention. The heating cooking utensils (1) are the left stove (2), the right stove (
72) Jj and Grill (11) are cat-catching. The left stove (2) has a burner (4), a trivet (7) for placing the steel, and a trivet (
It consists of a juice pan (6) placed under the burner (7), etc.
A thermistor (3) as a temperature sensor for detecting the temperature of the sole is provided in the center of 4) so as to slightly protrude from the upper surface of 5a [7]. A boiling liquid cover ring (5) is fitted around the burner (4) to prevent spilled liquid from entering the In-heat cooking utensil (1).

On the front surface of the left stove (2) side, there is provided an appliance plug knob (10) for igniting, extinguishing, and adjusting the firepower of the stove. Also attached to the front are a mode switching knob (8) for instructing the optimum cooking temperature depending on the cooking content, and a timer knob (91) for setting the time until the fire is extinguished.

In addition, on the front of the right stove (12) side, the right stove (12)
Also attached are appliance plug knobs (13) and (14) for igniting, extinguishing, and adjusting the firepower of the grill (11).

FIG. 2 is a block diagram of the automatic fire extinguishing system in the cooking appliance of the present invention.

Gas introduction path (26) that leads gas from the gas barrel inlet (23)
burner (1) via safety valve (21)
is familiar with

The safety valve (21) is opened and closed by a coil (27). The coil (27) is connected to the relay switch (31
) to the thermal lightning pair (30). The coil (27) holds the safety valve (21) open by the electromotive force of the thermal lightning pair (30) heated by the flame of the burner (4).

The relay switch (31) has a relay coil (32), (
33). When the relay coil (32) is energized, the relay switch (31) opens, and when the relay coil (33) is energized, the relay switch (31) is closed.

- F symbol - At one end of the mister (3) there is a switch (40)
A constant bias voltage is applied from a battery (39) via the battery (39). Since the thermistor (3) shows a voltage drop according to the detected temperature, a voltage corresponding to the voltage drop appears at the other end of the thermistor (3). This voltage is determined by the comparator (37)
is input. On the other hand, the D/A converter (38) has
A plurality of sweep digital signals are input from the microcomputer (36). Then, the D/A converter (
38) outputs an analog signal that varies over a predetermined period and a predetermined amplitude range in accordance with the sweep digital signal, and is inputted as a reference voltage to the comparison terminal of the comparison circuit (37).

Therefore, by knowing the digital signal at the time of change in the output of the comparator circuit (37), the thermistor (
3) The detected temperature can be known.

On the other hand, the other end of the thermistor (3) is input to a comparison circuit (29). Further, a constant bias voltage applied from the battery (39) via the switch (40) is applied to the resistor (
The voltage is divided by 28a) and (28b) and the comparator circuit (29)
is input as a reference voltage to the comparison terminal of Resistance (28
a).

The value of (28b) is set so that the reference voltage is approximately equal to the voltage appearing at the other end of the length mister (3) during detection of the automatic extinguishing temperature. The outputs of the comparison circuits (two) are input to the relay coil (32) via the driver (34) as described later.

The automatic extinguishing temperature is, for example, set to a predetermined temperature lower than the ignition temperature in consideration of safety, etc., based on the ignition temperature of the ura.

The microcomputer (36) is connected to the relay coil (33) through the driver (35), and the relay coil (33) is supplied with an excitation signal that closes the relay switch (31). Once the excitation signal is supplied, the relay switch (31) remains closed.

The microcomputer (36) also has an OR circuit (
22), the relay coil (32) through the driver (34)
)It is connected to the. The logical sum circuit (22) further includes:
The output of the comparison circuit (29) is also input. The relay coil (32) is excited when an excitation signal is supplied from the microcomputer (36) or when an excitation signal is input from the comparison circuit (29), and the relay coil (32) is energized when the relay switch (31) is closed. )open.

When the relay coil (32) has not reached the automatic extinguishing temperature, the microcomputer (36) and comparison circuit (
Since the excitation signal from 29) is not supplied, the relay coil (32) is not energized and the relay switch (31) is not heard. However, when the temperature detected by the thermistor (3) reaches the automatic extinguishing temperature, the microcomputer (
36) and the comparator circuit (29), the relay coil (32) is excited and the relay switch (31) is opened.

(43) is a mode changeover switch, which sets the cooking temperature in conjunction with the mode changeover knob (8).

(44) is a timer, and the above-mentioned timer knob (9)
The extinguishing time is set in conjunction with this, and when the set IR period elapses, a predetermined signal is sent to the microcomputer (36) to close the safety valve (21). Power is supplied to the microcomputer (36), comparison circuit (29), etc. from a dry battery (39) via a switch (40).

To explain the operation of the above configuration, first, the mode selector switch (43) selects key 1! ! ! Set the temperature. The switch (40) is then closed by pushing and turning the appliance stopper knob (10). At the same time, the safety valve (21) opens, gas is supplied, and the ignition means (
(not shown) is driven to ignite the burner. The valve state of the safety valve (21) is maintained by the electromotive force of the thermal lightning pair (30) heated by the flame.

After ignition, the temperature of the steel rises due to heating, → No Mister (
When the detected temperature in step 3) reaches the automatic extinguishing temperature, the microcomputer (36) detects that the automatic extinguishing temperature has been reached, sends a relay coil excitation signal to the OR circuit (22), and activates the relay switch (31). )open. As a result, the current flowing through the coil (27) is stopped, the safety valve (21) is closed, the gas supply is cut off, and automatic extinguishing is performed.

It's a shame, automatic extinguishing is encouragement 1 from comparison circuit (29)! (0
It is also done by number. That is, the thermistor (3)
When the detected temperature reaches the automatic extinguishing temperature, the comparison circuit (29
) becomes higher than the reference voltage, and the comparator circuit (29)
A relay coil excitation signal is generated at the output end of the relay coil. This excitation signal is input to the OR circuit (22) and the driver (3
4) to energize the relay coil (32).

In this way, the microcomputer (36), comparison circuit (
Since the b relay coil (32) is excited by which signal using two electrical means (29), even if the microcomputer (36) fails, it will not be activated by the operation of the comparator circuit (29). The safety pulp (21) is closed, gas supply is stopped, and automatic extinguishing can be performed.

Note that the present invention is not limited to the above-described embodiments, and for example, the microcomputer (36) may be replaced with circuits each having an independent function, and the gist of the present invention may be modified. It is possible to make changes to the design of the balance within the range that does not apply.

<Effects of the Invention> As described above, the present invention has the unique effect that even when the cooking temperature rises and reaches the automatic extinguishing temperature, the gas opening/closing means can be reliably closed and automatic extinguishing can be performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the heating cooking appliance of the present invention, and FIG. 2 is a block diagram of the automatic fire extinguishing system. (1)...Heating cooking appliance, (3)...Temperature sensor,
(21)... Gas opening/closing means, (29)... Comparison circuit constituting electrical means, (36
)...Microcomputer that constitutes electrical means

Claims (1)

[Claims] 1. A heating cooking appliance that is provided with a temperature sensor that detects the temperature of a cooking pot, and that automatically stops the gas supply by driving a gas opening/closing means when the detected temperature reaches the automatic extinguishing temperature, A cooking appliance characterized by having at least two electrical means for controlling the drive of the gas opening/closing means. 2. The heating cooking appliance according to claim 1, wherein one of the electrical means is a microcomputer, and the other one is a comparison circuit that operates independently of the microcomputer.